PDF malware analysis — malicious · e5137acd61b791e4

MALICIOUS

PDF

2.8 KB

MD5: 36fa7b676bbd020c59b3c39ed3c9f48f SHA-1: 79836ec003d959f16ad17e48e675df4637e1d048 SHA-256: e5137acd61b791e4a970b5c5b9f4da991ce6d3f870678732723d8e0c11c80f00

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript streams, named javascript_obj111611_000.js and javascript_obj111612_001.js, are the primary indicators of malicious activity. The presence of eval() and String.fromCharCode suggests obfuscation, common in droppers designed to download and execute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `5ecc28a3252f67b227e5242c9a7fe279d09d2de5de88e19264ce325b561e78d5`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `c583a8afdb68bd3bae65a7bc94a934ff1130ade633fc5e8bdffcb5eaae3f4a6b`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3308 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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